I've been trying to research the same thing since July when my mom was dx. with inflammatory breast cancer (very agressive form of breast cancer). She's 75 and has had Parkinsons for at least 5 years.
Here is what I know so far:
1) Compazine, commonly given for chemo-induced nausea, should not be used with Parkinson's patients since it increases rigidity. There are other newer (more expensive!) drugs can can be used, Kytril for example
2) The chemo drug taxol can cause lots of neurological symptions even in people without neurological diseases - avoid it! My mom is on the A-C regimen, a common chemo regimen, and is not having problems with the chemo per se.
3) the biggest problem is not the chemo drug interacting with the parkinson's drugs - it is the chemo causing extreme weakness, which aggravates the Parkinson's. Mom had to increase her Parkinson's med dosage to try to compensate a little.
That's all I know for know.
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